Re: VESA feature connector devices
Posted on 2020-04-12, 18:39
That connector is supposed to only support paletted 256 color modes which limited its usefulness a lot.
Re: HardMPU, anyone?
Posted on 2020-04-10, 14:31
You should find all the info needed from this and following posts : Re: FMonster, the monster of sound synth
Re: Flyback questions, no HV after recap and FB replacement
Posted on 2020-04-07, 19:16
If things work with original transformer the replacement is indeed not compatible in some way. I wonder if it simply is wrong type or has tolerance that falls outside of what your board accepts.
Re: What are some common failure modes for defective Voodoo2 cards?
Posted on 2020-04-05, 12:21
Freq depends on whatever resolution is needed, 1024x768 @ 60Hz isn't gonna need more than 60MHz pixel clock. the 30something MHz seems to be what is expected for 800x600. The traces look pretty rounded, your probes or scope isn't up for the task.
Re: BIOS image collection - requests, discussion etc
Posted on 2020-04-04, 20:28
I guess it is worth to try then. I remember there was very limited support for 486 and nothing for older stuff.
Re: Upgrade to 2MB TSeng VLB
Posted on 2020-04-04, 17:08
I don't think the GAL is needed. I have one Tseng card that also didn't have the sockets soldered and I decided to add them, populated them and also got garbage image. I imagine the cards had a design flaw which is why the sockets weren't populated in the first place but I haven't explored it yet, …
Re: BIOS image collection - requests, discussion etc
Posted on 2020-04-04, 16:21
Larger BIOSes often are not easily dumpable via software because what is on the BIOS chip and what ends up in BIOS area that DOS sees do not match (BIOS decompresses itself and only puts some stuff in the BIOS area through shadow RAM feature). Easiest way is to dump the chip using a dedicated memory …
Re: ISA VGA card with DVI port, could one be made?
Posted on 2020-04-04, 09:24
Yeah, that looks pretty much like what I had in mind. Would it require VLB, or would it also work in ISA slots, both 16-bit and 8-bit? One card to rule them all, so to speak? 😉 Between this, the PCI(e)/ISA converter and other stuff, you sure are working on some impressive and much-desired projects. …
Re: ISA VGA card with DVI port, could one be made?
Posted on 2020-04-04, 07:42
I have something started that can do that but there's plenty of time until it actually gets finished. Some other things are in the way and once I have time I probably lack money and things get delayed even more 🤣. http://www.tmeeco.eu/TKAVIVC/T-01VIVC-A.png
Re: SMD Capacitor weird residue like toothpaste ?
Posted on 2020-04-03, 13:21
These capacitors don't have anything that can leak out of them. Could be some flux residue or some foreign dirt that has deposited itself on the card over time.
Re: ISA PATA/IDE adapter vs HBA vs ? for larger drive, ISA-only PC
Posted on 2020-04-03, 08:07
ISA DMA is slower than PIO for the HDDs and no regular ISA IO card connects HDD DMA lines to the ISA ones anyway (and there's no software support on BIOS level anyway even if they were connected). I'm not aware of any IDE controller that can do bus mastering except maybe some of the caching …
Re: Purpose of pots (potentiometers) on old motherboards.
Posted on 2020-03-29, 05:31
Those are not potentiometers but trimmer caps. They are used to tune the relevant freq exact at a given temperature.
Re: Mobility radeon x700 and win9x.
Posted on 2020-03-28, 04:25
I added my ID's to [mfg] section in C8.INF file in the Catalyst 6.2 drivers : "ATI RADEON XPRESS 200" = RS480_ENU, PCI\VEN_1002&DEV_5955&SUBSYS_308B103C "ATI RADEON XPRESS 200 " = RS400_ENU, PCI\VEN_1002&DEV_5A41 "ATI RADEON XPRESS 200 Series" = RS482_ENU, PCI\VEN_1002&DEV_5974 You'll probably have …
Re: Mobility radeon x700 and win9x.
Posted on 2020-03-28, 02:14
It probably isn't supported by the existing drivers as is, but after adding the device IDs to the driver INF files it will probably work as it did with Xpress200 chipset's integrated video that I was using on my HP NX6125 laptop.
Re: Monitor color issue.
Posted on 2020-03-25, 21:59
If any of the colors lines were not connected there wouldn't be gray tones possible. This most probably is the video card identifying the monitor as something "not color" and a fix is setting ID pins to something that tells the video card "color monitor". I have modified several video cards into …
Re: PCI Bus Mastering in DOS
Posted on 2020-03-25, 03:15
Card can most probably move data faster than CPU can in its tightest loop when doing GUI acceleration operation such as scrolling which is where bus mastering probably comes in on those video cards. In DOS there's gonna be no interface for such a thing to be used and nothing will even know such a …
Re: Micro ATX 486 - what's the degree of interest?
Posted on 2020-03-22, 19:41
I have one of the Elan520 based PC104 boards, and the main problem is lack of cache which hurts performance a lot. PCI bus will allow all other things to be taken care of though.
Re: Which soundcard for late 486 windows 95 build.
Posted on 2020-03-20, 20:16
My vote goes for the Yamaha too (notbiasedatall lol). It is a much better Windows card than the others and works great in DOS, plus it will let you use MPU401/MIDI music in pure DOS without needing an external MIDI device (although YMF704 isn't particularly great sounding compared to most external …
Re: What is the purpose of having a high DMA channel on SB16 etc.
Posted on 2020-03-18, 13:35
High DMA channels let you transfer 16bits in one cycle rather than two. That is pretty much the only reason these channels exist and why they are used. WSS cards only use 8bit DMA channels and do twice as many DMA cycles compared if they used 16bit DMA that SB16 and few others can do.
Re: Help with fixing Creative TNT2 Ultra
Posted on 2020-03-18, 12:13
Yes, remove inductor and connect the two pads together (or put a wire across the inductor, but that won't look as neat usually). Those inductors and capacitors form a peaking network that relies on resonances to boost transitions of signals that makes some resolution (say 1024x768) look little …
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